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Byju's Answer
Standard XII
Mathematics
Complex Numbers
If x + iy 2...
Question
If
(
x
+
i
y
)
(
2
−
3
i
)
=
4
+
i
, then
A
x
=
−
14
3
,
y
=
5
13
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B
x
=
5
13
,
y
=
14
13
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C
x
=
14
13
,
y
=
5
13
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D
x
=
5
13
,
y
=
−
14
13
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Solution
The correct option is
A
x
=
5
13
,
y
=
14
13
Given,
(
x
+
i
y
)
(
2
−
3
i
)
=
4
+
i
∴
x
+
i
y
=
4
+
i
2
−
3
i
On rationalizing the denominator, we get
(
x
+
i
y
)
=
(
4
+
i
)
(
2
+
3
i
)
13
=
5
+
14
i
13
∴
x
=
5
13
,
y
=
14
13
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Similar questions
Q.
If
(
x
+
i
y
)
(
2
−
3
i
)
=
4
+
i
, then values of
x
and
y
are
Q.
The locus of the point which moves so that the square of its distance from the point
(
3
,
−
2
)
is numerically equal to its distance from the line
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Q.
If
5
-
3
2
+
3
=
x
+
y
3
, then
(a) x = 13, y = −7
(b) x = −13, y = 7
(c) x = −13, y = −7
(d) x = 13, y = 7